KR100300698B1 - Recording medium loading device and its control method - Google Patents

Abstract

A loading apparatus for loading a recording medium such as a disc shaped recording medium includes a conveying member, a drive unit, a detector and a controller. The conveying member moves between the recording medium exchange position and the disc-shaped recording medium recording and / or reproducing position. The drive unit drives the conveying member. The detector continuously detects the position of the conveying member that moves based on the driving force from the drive unit as the movable portion of the drive unit moves. The controller controls the drive unit so that the moving speed of the conveying member is slowed before the recording medium changing position and the recording medium recording / reproducing position of the conveying member based on the detection signal from the detector.

Description

Recording medium loading device and control method thereof

1 is a perspective view showing a state where a disc tray and a turn table are withdrawn from an outer casing of a disc player according to an embodiment of the present invention.

FIG. 2 is a plan view showing main parts of a turn table and a turn table rotating mechanism of the disc player shown in FIG.

3 is a longitudinal sectional view of the disc player shown in FIG. 1, showing the disc clamping state.

FIG. 4 is a longitudinal partial view showing the main part, shown in FIG. 3, under the disc clamping state; FIG.

FIG. 5 is a cross sectional view showing a state where the outer casing is removed from the disc player shown in FIG.

FIG. 6 is a diagram showing a loading mechanism under the loading state of the disc player shown in FIG.

7 shows a loading mechanism under a state in which the disc tray is withdrawn from the normal loading state.

FIG. 8 shows the loading mechanism with the disc tray withdrawn during playback. FIG.

FIG. 9 is a schematic diagram showing a loading state of the disc player shown in FIG.

FIG. 10 is a schematic diagram showing a state where the disc tray is slightly drawn out from the state shown in FIG.

FIG. 11 is a schematic diagram showing a state where the disc tray is further drawn out from the state shown in FIG.

FIG. 12 is a schematic diagram showing a state where the disc tray is slightly drawn out from the state shown in FIG.

FIG. 13 is a schematic diagram showing a state where the disc tray is withdrawn during playback of the disc player shown in FIG.

FIG. 14 is a schematic diagram showing a state in which the turn table is slightly rotated from the state shown in FIG.

FIG. 15 is a schematic diagram showing a state in which the turn table is skipped from the state shown in FIG.

FIG. 16 is a schematic diagram showing a state in which the turn table is rotated again from the state shown in FIG. 15 to the state shown in FIG.

17 is an enlarged plan view showing the reverse gear of the disc player shown in FIG.

18 is a block diagram showing an example of a structure of a main circuit for driving a loading motor.

FIG. 19 is a plan view showing an example of the structure of an encoder shown in FIG. 18. FIG.

20A and 20B are timing charts for explaining the output signals of the encoder shown in FIG. 19, FIG. 20A is a timing chart relating to output signal S1, and FIG. 20B is a timing chart relating to output signal S2.

21A to 21C are timing charts for explaining the case where the unloading operation is controlled according to the output signals shown in FIGS. 20A and 20B. FIG. 21A is a timing chart for the output signal S1. FIG. 21B is a timing chart relating to the output signal S2, and FIG. 21C is a timing chart showing a change in the PWM signal.

22A to 22C are timing charts for explaining the case in which the loading operation is controlled according to the output signals shown in FIGS. 20A and 20B, and FIG. 22A is a timing chart regarding the output signal S1, and FIG. 22B FIG. 22 is a timing chart relating to the output signal S2, and FIG. 22C is a timing chart showing the change of the PWM signal.

23A to 23E are diagrams showing examples of other output signals of the encoder, in which 23A is a timing chart regarding output signal S11, FIG. 23B is a timing chart regarding output signal S21, and FIG. 23C is an output signal. A timing chart relating to S31, FIG. 23D is a timing chart showing a change in the PWM signal, and FIG. 23E is a timing chart showing a change in the average voltage supplied to the loading motor 32. FIG.

24A and 24B are plan views showing another example of the structure of the encoder, where FIG. 24A is a view showing a change of patterns with respect to a rotation angle, and FIG. 24B is a view showing a pattern of an encoder.

25A to 25C are diagrams for explaining the output signals of the encoder shown in FIG. 24B, FIG. 25A is a timing chart relating to output signal S12, and FIG. 25B is a timing chart relating to output signal S22, 25c is a timing chart of the output signal S32.

FIG. 26 is a flowchart for explaining the operation of the embodiment shown in FIG.

* Explanation of symbols for main parts of the drawings

1: outer casing 2: disc tray

4: turntable 7a, 7b: optical disc

8: rotary drive mechanism 9: optical pickup

10: turning member 12: disk table

13: chucking plate 17: table rotating mechanism

22: large diameter storage unit 23: small diameter storage unit

26 disc detection optical sensor 28 reversing gear

29: main gear 32: loading motor

40: lock lever 101: encoder

102 controller 103 drive circuit

111: conductive plate

The present invention relates to a recording medium loading apparatus and a control method thereof. In particular, the present invention relates to a recording medium loading apparatus having a conveying member for loading a recording medium and a control method thereof.

In general, a disc playback player using a disc-shaped recording medium (simply referred to as a disc), such as an optical disc, is equipped with a loading device for loading or unloading a disc with respect to the player body. As in the case of so-called compact disc players, the loading device is provided with a disc tray, where the disc tray protrudes from the opening of the player body, the disc replacement position, and the disc tray is withdrawn into the player body through the opening. Position, and a playback or playback position. When a disc in the player is exchanged for another disc outside the player and the disc is loaded into the player, the user of the disc player presses a switch provided on the main body of the play to activate the movement of the disc tray through the opening of the player main body. Pull out the disc tray. The disc is loaded onto the disc loading recess of the disc tray drawn out of the player body. Thereafter, the operation switches are activated to return the disc tray into the player body. When the disc tray reaches the playback position in the player body, the movement of the disc tray is stopped. Thereafter, the disc playback portion and the disc tray are moved relative to each other, and the disc on the disc tray is placed on the disc table constituting the disc playback portion with the optical pickup. Under this condition, the disk is clamped by the chucking member and the disk table. When a playback command is input, the disc table is rotatably driven to drive the disc. After the disk has been rotated at a predetermined speed, a light beam is projected from the optical pickup to read the information signal recorded on the disk. When the disc tray is unloaded, the disc playback portion and the disc tray are moved again with respect to each other, and the clamping of the disc between the disc table and the chucking member is released. Then, as described above, the disc tray is drawn out through the opening of the player body.

However, in the case of a disc player having such a disc tray, it is necessary to stop the disc tray as accurately as possible at predetermined positions such as a disc replacement position and a disc playback position. In particular, when the disc tray reaches the playback position, the positions of the disc tray and the disc playback portion should be as accurate as possible because these two members are moved relative to each other. For this reason, in the case of the above disc player, detector switches for detecting the position of the disc tray are provided. The detector switches are actuated by the disc tray itself or by a member moving with the disc tray. Detector switches are provided at the disc replacement position of the disc tray and the playback position of the disc tray, respectively. These switches are operated to turn on or turn off when the disc tray reaches the exchange position and the playback position. Output signals are supplied to the controller, which causes the motor, which is the driving source of the moving mechanism for moving the disc tray, to be stopped based on the output signals corresponding to the switch operation of the operation and stop.

Therefore, since the motor rotates at a constant speed for a period of time before the detector switches are operated, the motor is suddenly stopped when the detector switches are operated by the disc tray or the like. The reason is that the fact that the disc table has reached the exchange position and the playback position can be detected, while on the other hand it is not possible to detect whether the disc tray is in position. Therefore, it is not possible to smoothly or smoothly stop the disc tray at the exchange position or the playback position by controlling the moving speed of the disc tray before the disc tray reaches the exchange position or the playback position.

In order to solve the problem, it may be considered to provide a plurality of detector switches on the movement trajectory of the disc tray. However, in this case, not only is the cost increased, but there is also a concern that the production work efficiency may be reduced due to the need to adjust the operation timing of each detector.

Therefore, it is an object of the present invention to provide a recording medium loading apparatus that solves the above problems.

It is still another object of the present invention to provide a method of controlling a recording medium conveying apparatus, which solves the above problems.

According to the present invention, there is provided a recording medium loading apparatus including a conveying member, driving means and control means. The conveying member conveys the recording medium between the recording medium exchange position and the recording medium recording and / or reproducing position. The drive means drives the conveying member. The drive means includes a rotation drive unit for driving the conveying member and a detection unit for detecting the amount of rotation of the rotation drive member. The detection unit continuously detects rotation of the rotation drive member. The control means controls the driver based on the detection signal from the detector.

According to another aspect of the present invention, there is provided a disk-type recording medium loading apparatus including a conveying member, a drive unit, a detection unit, and a controller. The conveying member conveys the disk-shaped recording medium between the disk-type recording medium exchange position and the disk-type recording medium recording and / or reproducing position. The drive unit drives the conveying member. The detection unit continuously detects the position of the conveyed member that is moved based on the driving force from the drive unit in accordance with the movement of the movable portion of the drive unit. The controller controls the drive unit based on the detection signal from the detection unit.

According to another aspect of the present invention, a recording medium is conveyed between a recording medium exchange position and a recording and / or reproducing position with respect to the recording medium based on a driving force transmitted from a drive unit to which a pulse width modulation (PWM) signal is supplied. A method of controlling a conveying apparatus for conveying a recording medium by using a conveying member is provided. The method includes continuously detecting the position of the conveying member by the detection unit in accordance with the movement of the movable portion of the drive unit; Generating a control signal to control the duty of the PWM signal corresponding to the position of the conveying member based on the detection signal from the detection means; Changing the duty of the PWM signal based on the control signal generated in the control signal generation step to change the moving speed of the conveying member.

According to the present invention, the position of the conveying member of the recording medium moved on the basis of the driving force of the drive unit is detected in accordance with the movement of the movable portion of the drive unit. Based on this detection result, the motor used as the drive source of the drive unit is controlled. In detail, the duty of the PWM signal supplied to the motor is changed based on the detection result. As a result, since the moving speed of the conveying member can be slowed down before the exchange position of the conveying member and the recording and / or reproducing action, the conveying member can be smoothly or smoothly stopped at the respective positions described above.

An embodiment of the present invention will now be described in detail with reference to the accompanying drawings. In the present embodiment, the disc player to which the present invention belongs is applied to an apparatus for reproducing an optical audio disc, which is an example of recording discs.

As shown in FIG. 1, the disc player has an outer casing 1 composed of a box-shaped body 1a having an opening on the front side and a front panel 1b for closing the front opening of the box-shaped body 1a. Equipped) In the substantially center of the front panel 1b there is formed a slot 1c extending laterally. A substantially rectangular flat disk tray 2 is mounted retractably through the slot 1c of the front panel 1b. On the front panel b, a power button 3a for supplying and interrupting power supplied from an external power source and a turntable 4 rotatably held on the disc tray 2 are provided. The skip button 3c and other buttons are arranged. Display area 3d displays an input state or a play state.

As shown in Figs. 3 to 5, a base member 5 having a size substantially the same as that of the disc tray 2 is placed on the lower surface portion of the box-shaped body 1a of the outer casing 1; Is mounted. On both sides of the lower surface of the disc tray 2, a pair of guide grooves 2a extending forward and backward, respectively, are formed. Guide protrusions 5a that engage the guide grooves 2a are formed on the upper surface of the base member 5. By the combination of the pair of guide grooves 2a and the guide protrusion 5a, the disc tray 2 is linearly movable forward and backward with respect to the base member 5. Retainer parts 6a, 6b mounted on the base member 5 engage with a pair of lateral grooves 2b formed in the side walls of the disc tray 2 so that the disc tray 2 exits. Prevents any rise of the disc tray 2.

Rotate to read the optical discs 7a, 7b and / or information signals from these optical discs 7a, 7b on the rear part of the box-shaped body 1a in the rearward direction in which the disc tray 2 is recovered. A rotation drive mechanism 8 is provided for holding and rotationally driving the optical pickup 9, which is a pickup device facing the optical disks (FIG. 1, 7a, 7b) rotatably driven by the drive mechanism 8. do. In the rear part of the disc tray 2, a substantially rectangular cutout (Fig. 6, 2c) is formed. The turning member 10 is provided in the cutout 2c. The pair of pivot shafts 10b protrude from both sides of the pivot member 10, respectively. The pivot shafts 10b are rotatably coupled with both sides of the cutout 2c such that the pivot member 10 is pivotally mounted to be pivotable upward and downward with respect to the base member 5.

The rotary drive mechanism 8 cooperates with the disk table 12 mounted on the drive shaft of the spindle motor 11, the spindle motor 11, and the disk table 12 to clamp the optical disks 7a and 7b. It consists of a chucking plate (13). The spindle motor 11 is directly mounted upward by the drive shaft on the front edge side of the pivot member 10. A substantially cylindrical protrusion is formed in the center of the top surface of the disc table to hold the optical discs 7a, 7b in a center. The chucking plate 13 is rotatably supported by the arm bracket 14 so as to face the upper surface of the disk table 12. Arm bracket 14 is substantially L-shaped in longitudinal section. One arm of the arm bracket 14 is fixed to the rear wall of the box-shaped body 1a, and the other arm extends in the transverse direction. The chucking plate 13 is floatingly supported at the distal end of the horizontal arm.

The optical pickup 9 has a light source such as a laser diode, a predetermined optical device such as a beam splitter and a collimator lens, and an optical block incorporating an optical detector such as a photodiode, and mounted on top of the optical block. Configured actuator. The actuator supports the movable objective lenses to focus the luminous flux emitted from the optical block onto the signal recording surface of the optical discs 7a and 7b. The optical pickup 9 is supported by guide shafts (FIGS. 6, 7, 16) mounted on the upper surface of the pivot member 10, and is movable backwards and forwards in a direction far from the disk table 12. The rear side of the disk table 12 is provided. The objective lenses of the optical pickup 9 are directed upward, and the optical axis of the objective lenses is substantially parallel to the drive axis of the spindle motor 11.

On the upper surface of the disc tray 2, a turn table 4 is provided for positioning and accommodating a plurality of kinds of optical discs 7a and 7b having different diameters. The turn table 4 is formed in the shape of a disk having a thickness smaller than the thickness of the disk tray 2 and is accommodated in a circular recess formed in the upper surface portion of the disk tray 2. The turn table is then rotatably supported about a central axis 26 provided on the center portion of the disc tray 2 so as to be rotatable about the disc tray 2. For this reason, as best shown in FIG. 2, the inner gear portion 4a is formed radially inward of the turn table 4 over the entire circumferential direction of the turn table 4. The table rotating mechanism 17 is provided adjacent to the central axis 26 of the disc tray 2 to rotatably drive the turn table 4 via the internal gear portion 4a.

As shown in FIGS. 2 and 5, the table rotating mechanism 17 includes a table rotating motor 18 having a drive shaft on which the driving pulley 18a is mounted, and a driving pulley 18a by a driving belt. A worm gear 19 having one end mounted with a driven pulley 19a operatively connected to the pinion 20 coupled to the worm gear 19 and rotatably driven together with the pinion 20 It consists of a table rotary gear 21 engaged with the internal gear portion 4a of the turn table 4. The table rotary motor 18, the worm gear 19, the pinion 20 and the table rotary gear 21 are fixedly or rotatably supported by the unit plate 17a. The table rotating mechanism 17 is mounted on the disc tray 2 via the unit plate 17a.

For example, the optical discs 7a and 7b refer to large optical audio discs 12 cm in diameter and small optical audio discs 8 cm in diameter, respectively. On the upper surface of the turn table 4, as shown in FIGS. 1 and 2, in order to position and load the optical foil disks 7a and 7b, a large diameter corresponding to the diameter of the large optical disk 7a A plurality of large diameter recessed portions 22 for positioning the disk 22 are formed and arranged on the same circle at predetermined intervals in the circumferential direction. In addition, small diameter recess portions 23 for positioning the small disks corresponding to the small diameter optical disk 7b are formed coaxially on the lower portions of the large diameter recess portions 22 of the small angle.

With respect to each of the large diameter recess portions 22 and the small diameter recess portions 23, the disk table 12 has a large diameter recess portion 22 or a small diameter recess portion 23 for positioning the disks. Slot or cutout 24 is turned so that the center of the optical discs 7a, 7b positioned by It is formed on the table 4. When the central portions of each of the large diameter recess portions 22 and the small diameter recess portions 23 are moved at an angle above the rotational drive mechanism 8, each slot 24 is connected to the disc tray 2. Extends from the large diameter recess portion 22 and the small diameter recess portion 23 to the circumferential edge portion of the turntable 4 in the retrieval and ejection direction of the disc player, that is, in the rear and forward direction of the disc player.

In addition, slits 24a are formed at inner end portions of the respective slots 24 to prevent rotation of the turntable 4. The stoppers (FIGS. 6, 7, and 15) formed on the turning side distal end portion of the revolving member 10 are detachably coupled to the slit 24a. That is, when the turn table 4 is in a predetermined position and is raised under the pivot member 10 or the disc chucking state, the stopper 15 is coupled to the slit 24a to prevent rotation of the turn table 4. On the other hand, the predetermined address is previously assigned to the disc storage recess portion by all combinations. According to this embodiment, addresses 1 to 5 are assigned to the disc accommodating recess portions.

In order to perform a position control operation such as a turn table, a disc detection optical sensor 26 for detecting the presence or absence of the optical discs 7a and 7b, a large diameter recessed portion 22 and a small diameter recessed portion ( An address detection optical sensor 27 is provided for detecting an address assigned to each combination of 23.

The disc detection optical sensor 26 detects whether the optical discs 7a and 7b are present on either one of the large diameter recessed portion 22 and the small diameter recessed portion 23 of the turntable 4. Is provided for. In this connection, disc detection through holes 25 are formed at equal intervals about the central axis 26 in each of the small diameter recessed portions 23 of the turn table 4. The disc detection optical sensor 26 is provided at a predetermined position below the disc detection through hole 25 on the disc tray 2. The optical sensor 26 detects the optical disks 7a, 7b which are put in place in opposing relations, and which one of the disk detection through holes 25 is when the turntable 4 is positioned at a predetermined angled position. It is to output the detection signal through.

The disk detecting optical sensor 26 has a light emitting element such as a light emitting diode (LED) and a light receiving element such as a photo diode (PD), so that half-light is caused by an object detected by the light beam emitted from the light emitting element. To be detected. The optical sensor 26 has a large diameter placed in the large diameter recessed portion 22 when the turntable is at a predetermined angled position, that is, when the disc receiving recessed portion is located above the optical pickup 9. The presence of the small diameter optical disk 7b placed in the optical disk 7a or the small diameter recessed portion 23 is detected through the disk detection through hole 25.

As shown in Figs. 5 to 8, they are formed in the rack portion 2e and the disc tray 2 extending from the front side to the rear side. Coupling with this rack portion 2e is a rack side gear 28a provided in the reversing gear 28. The rack side gear 29a provided in the main gear 29 is originally separated from the rack portion 2e, and is engaged with the rack portion 2e after the main gear 29 is rotated by a predetermined angle.

As enlarged in FIG. 17, the reversing gear 28 has an input side gear 28b spaced axially from the rack side gear 28a. The input gear 28 has a pitch circle that is different from the pitch circle of the rack side gear 28a, but has an angle θ per one tooth (i.e., the same number of teeth) that is equal to the angle per tooth of the rack side gear 28a. . In order to keep the angle θ per tooth equal, the modulus of the input side gear 28b is made small by reducing the size of each tooth. The inverted side gear 29b provided in the main gear 29 is originally separated, but can be engaged with the input side gear 28b of the inverted gear 28 after the inverted side gear 29b is rotated by a predetermined angle.

The inverted gear 28 is rotatably supported by the base member 5 by the inverted gear pivot 30, while the main gear 29 is also supported by the main gear pivot 30 by the base member 5. Is rotatably supported. The main gear 29 has an internal gear portion 29c over its entire inner circumferential surface, and a single drive source is operably connected to the loading motor 32 via a gear train mechanism engaged with the internal gear portion 29c. .

The loading motor 32 is mounted on the base member 5, the drive shaft of which is directed downward. The drive pulley 32a is mounted on the drive shaft. The drive belt 33 is placed around the driven pulley 34a mounted on one end of the rotational shaft 34 with one side rotated about the drive pulley 32a and the other side rotated with respect to the base member 5. . On the other end of the pivot 34 is mounted an input gear 35. The input gear 35, the pivot shaft 34 and the driven pulley 34a are rotatably driven together. The input gear portion 36a of the intermediate gear 36 which is rotated with respect to the base member 5 is engaged with the input gear 35. An output gear portion 36b integrally formed with the input gear portion 36a is engaged with the internal gear portion 29c of the main gear 29.

On the upper surface of the main gear 29, the casing 1 at a predetermined interval concentrically with the inner cam portion 29d formed substantially circularly about the main gear rotation shaft 31 and a part of the inner cam portion 29d. The outer cam portion 29e having a substantially arc shape formed on the front side of the s) is formed. The cam protrusion 2f protruding from the lower surface of the disc tray 2 is insertable between the inner cam portion 29d and the outer cam portion 29e. The cam protrusion 2f extends in the direction in which the tray is recovered or protruded. Under the state where the disc tray 2 is completely stored into the casing 1, the cam protrusion 2f is positioned between the inner cam portion 29d and the outer cam portion 29e, so that the disc tray 2 is placed on the outside. To prevent escape. On the other hand, when the main gear 29 rotates by a predetermined angle, the main gear 29 moves at an angle so that the outer cam portion 29e is separated from the cam protrusion 2f, so that the withdrawal of the disc tray 2 is carried out. It becomes possible.

In addition, the upper and lower gears 29f that are engageable with the gear portion 37a of the upper and lower members 37 are provided in the main gear 29. The upper and lower members 37 are rotatably supported by the upper and lower pivot 38 mounted on the base member 5. The upper and lower members 37 have an inclined slide portion 37b that is slidably engaged with the guide protrusion 10a formed on the swing side distal end portion of the swing member 10. The inclined sliding portion 37b is formed on the opposite side of the gear portion 37a. On the other hand, since both teeth 376 located at both ends of the gear portion 37a have a height higher than that of the other teeth, the engagement with the upper and lower gears 29f of the main gear is improved.

In addition, the inclined slide portion 37b is such that when the guide protrusion 10a is positioned at the uppermost position of the inclined slide portion 37b, the pivot member 10 is held substantially in the horizontal direction as shown in FIG. It is formed spirally around the up and down pivot 38. Under this condition, the optical disc 7a is chucked by the rotation drive mechanism 8. On the other hand, when the guide protrusion 10a is positioned at the lowermost position of the inclined sliding portion 37b, as shown in FIG. 4, the pivot member 10 is opposed to the rear sides of the pivot member 10. As shown in FIG. The shaft portions 10b protruding from the surface are inclined downwardly at an angle. Under this condition, the optical disc 7a is released from the rotation drive mechanism 8.

The pivot member 10 satisfies the conditions to be swiveled in the above-described rotation range of the inclined slide portion 37b, and should be fixed in this range. For this reason, the number of teeth required to move the guide protrusion 10a from the uppermost end of the inclined sliding part 37b to the lowermost end engages with the gear part 37a of the upper and lower members 37 and the gear part 37a. Each of the upper and lower gears 29f of the main gear is provided. The cylindrical surface 29g is provided on the main gear 29 except for the upper and lower gears 29f. Arc surfaces 37c in sliding contact with the cylindrical surface 29g are formed on both sides of the gear portion 37a. By using these arc-shaped surfaces 37c and the cylindrical surface 29g, the rotation preventing mechanism for the upper and lower members 37 becomes effective.

The locking lever 40 is shown in FIGS. 5 and 6. One end of the locking lever 40 is pivotally mounted onto the base member 5 by the support shaft 41, and the other end of the opening lever 1c of the front panel 1b is provided with a stopper portion 40a. Extend towards. The cam input part 40b which protrudes toward the main gear 29 is formed in the intermediate part of the lock lever 40, and comes into contact with the outer peripheral surface of the main gear 29. As shown in FIG. Reference numeral 42 denotes a spring for biasing the lock lever 40 such that the cam input 40b is pressed against the main gear 29.

On the outer circumferential surface of the main gear 29, the movement of the disc tray 2 when any one of the disc receiving positions of the turntable 4 is moved at an angle from the position corresponding to the optical pickup 9 at the time of unloading A cam portion 29h is provided for pressing the cam input portion 40b at the end of the locking lever 40 on the path and projecting the stopper portion 40a. For this purpose, an L-shaped stopper accommodating portion 2g is formed on the lower surface of the disc tray 2, and as shown in FIG. 8, the stopper accommodating portion 2g is formed with the stopper portion 40a. In this manner, the disc tray 2 is prevented from being inserted when the locking lever 40 protrudes by the cam portion 29h. The locking mechanism for preventing the loading operation for disc change during playback is composed of the locking lever 40, the cam portion 29h of the main gear 29, and the stopper housing of the disc tray 2.

In order to ensure the operation of the locking mechanism, a locking mechanism is provided in relation to the reversing gear 28 and the rack portion 2e. The locking mechanism has a sliding gear 43 having the same rack as the rack of the rack portion 2e, a return spring 44 for biasing the sliding gear 43 backward, and the sliding gear 43 in the initial state. A resistance lever 45 that engages with a protrusion formed on the slide gear 43 to prevent movement back and forth, and a return spring 46 for biasing the resistance lever 45 toward the protrusion to generate resistance. The sliding gear is slidably mounted rearward and forward on the base member 5 such that a part of the rack of the sliding gear overlaps with an end portion of the rack portion 2e. The locking mechanism rotates and locks the main gear 29 under an operation of moving the disc tray 2 forward by the rotational force of the reversing glove 28 during playback, and the movement of the disc tray 2 is stopped. It is necessary to perform the operation of pivoting the lever 40.

Therefore, in FIG. 8, when the main gear 29 is rotated counterclockwise, the cam portion 29h comes into contact with the cam input portion 40b from the side of the opening 1c, and at the other end the stopper portion ( 40a approaches the main gear 29. Therefore, the stopper portion 40a deviates from the movement path of the stopper accommodating portion 2g, at which time the disc accommodating position is substantially the same as that of the optical pickup 9. Therefore, the disc tray 2 can be pressed or taken out manually. On the other hand, when the main gear 29 rotates clockwise, and the cam portion 29h contacts the cam input portion 40b to press the cam input portion, the stopper portion 40a at the other end is removed from the main gear 29. Is released. As a result, the stopper portion 40a is moved on the movement path of the stopper housing portion 2g. Therefore, the pressing of the disc tray 2 cannot be performed.

6 to 8, the set lever 47 is rotatably supported on the base member 5 by the support shaft 48. Set lever 47 to engage with main gear 29 and to prevent rotation of main gear 29 when main gear 29 is separated from rack portion 2e to form an intermediate point of normal loading operation. This is used. An engagement protrusion 47a is formed at one end of the set lever 47 to come into contact with the main gear 29 by a spring 49 that pulls the other end of the set lever 47. Three protruding accommodation portions 29i having grooves formed in a V shape are formed in the main gear 29.

The first gear train is formed by the rack side gear 29a of the main gear 29 and the rack portion 2e of the disc tray 2. The first actuating mechanism is formed by the first gear train and the upper and lower members 37. The second gear train is formed by the inverting side gear 29b, the inverting gear 28, and the rack portion 2e of the main gear 29. The second actuating mechanism is formed by the second gear train.

The disc player has a memory means such as a ROM described later. Various input signals from the disc detection sensor 26, the adjective detection sensor 27, the operation button 3b, the skip button 3c and other devices are input into the controller. Based on these input signals, the controller outputs control signals to the table rotating motor 18, the loading motor 32, and the like, to perform loading operation, playback, and the like, as described below.

In the disc player manufactured according to the present invention, the large diameter optical disc 7a housed in the large diameter recess portion 22 of the turn table is reproduced or the small diameter optical disc housed in the small diameter recess portion 23. In the case where 7b is reproduced, it is possible to selectively perform "normal loading operation" and "loading operation during the playback". Normal loading operation means that the optical discs 7a, 7b are set in the large diameter recessed portion 22 or the small diameter recessed portion 23 of the turn table 4 to form a reproducible state before playback. . The loading operation during playback is such that the optical disks 7a and 7b are set on some large diameter recessed portion 22 or the small diameter recessed portion 23 or previously set by the optical disks 7a and 7b during playback. By replacing the disc with another disc, it means that the disc is placed in a playable state.

As shown in Figs. 6 and 7, and 9 to 12, the normal loading operation is performed by the following operations. 6 shows a loading state in which the disc tray 2 is completely accommodated in the casing 1. 9 schematically illustrates this state. 7 shows an unloading state in which the disc tray 2 is completely withdrawn from the normal loading state. 11 shows this state schematically.

First, the power source button 3a on the front panel 1b is operated. After the electric power is supplied to the main disc player, the operation button 3b is operated. As a result, power is supplied to the loading motor 32 through operation of the controller. Rotational torque is transmitted from the drive pulley 32a through the drive belt 33 to the driven pulley 34a, and then the input gear of the intermediate gear 36 from the input gear 35 formed integrally with the driven pulley 34a. It is transmitted to the inner gear portion 29c and finally to the main gear 29 through the portion 36a and the output gear portion 36b.

As a result, the main gear 29 is rotatably driven in the counterclockwise direction of FIG. First, the upper and lower gears 29f of the main gear 29 are engaged with the gear portion 37a of the upper and lower right members 37 so that the upper and lower members 37 rotate clockwise in FIG. 6 to correspond to the number of teeth. Done. As a result, the guide protrusion 10a of the turning member 10 is guided from the top portion (state shown in FIG. 3) to the bottom portion (fourth) by the guide of the inclined slide portion 37b of the upper and lower members 37. The state shown in the figure). Thus, since the pivot member 10 is pivoted forward with respect to the shaft portions 10b, the optical pickup 9 placed on the pivot member 10 is lowered, and at the same time, the disk table of the rotation drive mechanism 8 (12) is separated from the chucking plate 13, so that the clamping operation for the optical disk 7a is released.

When the pivot member 10 is lowered to the lowermost end, the pivot member 10 is in sliding contact with the upper and lower gears 29f and the arc-shaped surface 37c of the gear portion 37a. For this reason, while the main gear 29 continues to rotate forward, the upper and lower members 37 are prevented from rotating by the main gear 29, thereby keeping the turning member 10 fixed at the lowermost position. Then, when the main gear 29 rotates by a predetermined angle, the rack side gear 29a is engaged with the rack portion 2e of the disc tray 2, so that the disc tray 2 is moved forward.

In this case, when the pivot member 10 is lowered, the stopper 15 protruding from the tip portion of the pivot member 10 is moved to the slit 24a provided in the lower portion of the cutting slot? 4 of the turntable 4. Is released downward. At the same time, the table rotation motor 18 is rotatably driven, and the rotational torque of the drive shaft is transmitted from the drive pulley 18a to the driven pulley 19a through the drive belt, and then integrally with the driven pulley 19a. It is transmitted from the worm gear 19 to the pinion 20 coupled with the worm 19 in the rotational direction. Since the table rotating gear 21 is fixedly mounted on the pinion 20, the turn table B is counterclockwise (in FIG. 10) through the internal gear portion 4a coupled with the table rotating gear 21. Driven to rotate.

The amount of rotation of the turn table 4 is detected by the disk detection sensor 26 and the address detection sensor 27. Since the controller outputs control signals based on the detection signals, as shown in FIG. 11, when the turn table 4 is rotated by a predetermined angle to reach address 1 via two positions, the turn table 4 Rotation is stopped. Thus, the disc player is kept under an unloading state, and loading of the optical discs 7a and 7b on address 1 is possible.

Thus, when one optical disc 7a, 7b is loaded and played on the turn table 4, the operation button 3b is turned on for the loading state. This operation is the reverse of the above-described loading operation.

That is, when the operation button 3b is turned on, the loading motor 32 is rotated through the operation of the controller in the direction opposite to the above-described direction. The main gear 29 is driven to rotate clockwise. Rotational torque of the main gear 29 is transmitted from the rack portion 2e to the disc tray 2. The disc tray 2 and the turn table 4 are moved from the state in which the tray and the turn table are drawn out as much as shown in FIG. 11 to the state in which the tray and the turn table are almost half drawn as shown in FIG. Then, the upper and lower gears 29f of the main gear 29 are engaged with the gear portion 37a of the upper and lower members 37, and the upper and lower members 37 are rotated counterclockwise.

At the same time, the table rotating motor 18 is rotated in the reverse direction, thereby rotating the turntable 4 by two positions up to the position where the address 1 corresponds to the initial position opposite the optical pickup 9. Thus, as shown in FIG. 3, the pivot member 10 is raised by the action of the inclined slide portion 37b, and the optical disk 7a is clamped by the rotation drive mechanism 8. At the same time, the optical pickup 9 faces the information recording surface of the optical disc 7a. Thus, the loading operation of the main disc player is completed.

Now, the loading operation during playback will be described. As shown in Figs. 6, 8 and 13 to 16, the loading operation during playback is performed by the following operations. On the other hand, FIG. 8 shows the unloading state in which the disc tray 2 is completely drawn out from the loading state during playback. Figure 13 schematically illustrates this state.

When the disc player is in the play state and the operation button 3b is turned on, the loading motor 32 is rotated in the direction opposite to that of the normal loading operation based on the control signal supplied from the controller, and the main gear 29 It is driven to rotate clockwise (Fig. 6). Accordingly, the inverting gear 29b of the main gear 29 is engaged with the input gear 28b of the inverting gear 28, thereby driving the inverting gear 28 to rotate counterclockwise. As a result, through the action of the rack portion 2e coupled with the rack side gear 28a integrated with the input side gear 28b, the disc tray 2 moves forward as shown in Figs. Can be. Then, as shown in FIG. 14, the turn table 4 is rotationally driven by the table rotating motor 18 to expose the addresses 2, 3 to the outside.

As a result, the disc tray 2 and the turn table are widely exposed in front of the casing 1 and can load the optical discs 7a and 7b on these exposed addresses 2 and 3. In this case, since the main gear 29 and the upper and lower members 37 are formed separately and the rotation of the upper and lower members 37 is prevented by the main gear 29, any unnecessary vibration generated by the main gear 29 is eliminated. It can be prevented from being applied to the turning member 10 via the upper and lower members 37. Thus, since there is no fear that unnecessary vibration caused by the rotation of the main gear 29 will be applied to the pivot member 10, the optical disks 7a and 7b without causing any adverse effect on the playback operation even while in the play state. ) Can be exchanged.

Thus, in the present embodiment, the rotation angle of the turn table is controlled so that two optical disks can be immediately replaced with other optical disks. For this reason, in the state shown in FIG. 14, each of the cutting slots 24 at addresses 1 and 5, which are the disk storing positions closest to the positions at which the rotary drive mechanism 8 and the optical pickup 9 are located, is rotated in the rotational direction. Displaced or biased. Therefore, when the disc tray 2 is pressed without any operation, since the pivot member 10 is placed in the playback state in which the pivot member 10 is raised, the rotary drive mechanism 8 loaded on the pivot member 10 is loaded. ) May come into contact with the frozen table 4, resulting in damage to the rotary drive mechanism 8 or the like. In order to avoid such damage, the locking mechanism is operated.

That is, when the main gear 29 is rotated by a predetermined angle, the cam portion 29h formed on the main gear 29 comes into press contact with the cam input portion 40b of the lock lever 40, so that the lock lever 40 ) Is turned counterclockwise in FIG. As a result, the stopper portion 40a formed at the tip end of the locking lever 40 protrudes into the movement path of the stopper accommodating portion 29 formed on the disc tray 2. Therefore, when the disc tray 2 is pressed down, the stopper accommodating portion 2g comes into contact with the stopper portion 40a of the locking lever 40, thereby preventing the disc tray 2 from being pressed. As a result, it is possible to avoid the possibility that the turn table 4 will be pressed by the rotation drive mechanism 8 in the play state and the rotation drive mechanism 8 and the like will be damaged.

After the optical disks 7a and 7b have been replaced with new optical disks as described above, when the optical disks 7a are to be loaded onto other empty addresses 4 and 5, the skip button 3c may be operated. As a result, the turntable 4 is moved at an angle in the clockwise or counterclockwise direction shown in FIG. 15 through the action of the table rotary motor 18 in accordance with the output of the controller, so that the empty addresses 4 and 5 are externally moved. Will be exposed. Because of this, optical disks already loaded at addresses 4 and 5 can be exchanged for other optical disks.

As described above, when the disc tray 2 is pressed from the state shown in FIG. 14 or FIG. 15, the operation button 3b is operated for the loading state. This operation is the reverse of the unloading operation described above.

That is, when the operation button 3b is operated, as shown in FIG. 16, the turn table 4 is moved to the initial position (shown in FIG. 13) by the table rotating motor 18 according to the operation of the controller. It is rotated again in the direction opposite to the above-described operating direction. Next, the loading motor 32 is rotated again in the reverse direction, and the main gear 29 is driven to rotate in the counterclockwise direction. As a result, the rotational torque of the main gear 29 is transmitted from the inverting gear 29b to the input gear 28b of the inverting gear 28, and then from the rack side gear 28a of the inverting gear 28 to the rack portion. It is transferred to the disc tray 2 via 2e. As a result, the disk cradle 2 and the turn table 4 are pressed from the state shown in FIG. 16 to which they are drawn out from the state shown in FIG.

In the loading operation, when the optical disk is loaded on the large diameter housing 22 or the small diameter housing 23 facing the rotary drive mechanism 8 or the like, the disc detecting optical sensor 26 is present in the optical disk. Is detected and the detection signal is input into the controller. As a result, the controller controls the table rotating motor 18 to rotate the turn table 4 so that an empty address, on which no disk is loaded, faces the rotation drive mechanism 8 or the like. In this case, therefore, the optical disk in the play state is stored in an empty address, that is, the disk DISC1 of the present embodiment.

On the other hand, since the angle G per tooth is the same between the rack-side gear 28a and the input gear 28b of the reversing gear 28 with different pitch circles, the reversing gear 28 is positioned with high accuracy at the time of manufacture. It is necessary to make the reversal gear 28 in any desired position. Thus, unlike conventional manufacturing methods, it is not necessary to use a special jig or to mark the alignment parts on the mechanical parts to position the reversing gear 28. In any manufacturing position, the rack portion 2e of the disc tray 2 can always be engaged due to the predetermined positional relationship of the rack side gear 28a, and the inverted gear 29b of the input side gear 28b and the main gear 20 is also possible. Can be realized, so that a high production efficiency can be obtained.

Now, a control operation for loading or unloading a disc tray of a disc player via a controller according to the present invention will be described.

18 is a block diagram showing a main circuit for controlling the device of the main gear 29. As shown in FIG. On the lower side of the main gear 29 an encoder 101 is provided. As shown in FIG. 19, the encoder 101 is mounted on the bottom surface of the main gear 29 and mounted on a rotating plate (not shown) which rotates together with the main gear 29, and on a fixed part of the disc player. It consists of the electrically conductive plate 111. A plurality of brushes are provided on the rotating plate to contact the patterns 111a and 111b of the conductive plate 111 and slide along the patterns. The number of brushes 112 is determined according to the patterns of the conductive plate 111. The output signal from the encoder 101 is continuously output in accordance with the rotation of the main gear 29 and is supplied to the controller 102. The controller 102 is composed of a microcomputer. As described above, key input units such as the disc detection optical sensor 26, the address detection optical sensor 27, the power source button 3a, the operation bucket 3b, the skip button 3c, and other buttons are provided from the input unit. Input signals and output signals from the optical pickup 9 are input into the controller 102. The controller 102 controls the control of the table drive motor 18 and the recording or reproducing operation of the entire disc player. The controller 102 also supplies control signals for driving the motor 32 based on the output signal from the encoder 101. The controller 102 also incorporates a ROM 102A therein for storing data (described below) to determine the duty of the PWM signals supplied to the loading motor 32. The drive circuit 103 generates PWM signals as drive signals for driving the loading motor 32 based on the control signal from the controller 102, and the generated PWM signals are supplied to the loading motor 32. . As a result, the loading motor 32 controls according to the PWM signals from the drive circuit 103 to rotate the main gear 29 to perform the loading or unloading operation of the disc tray 2 as described above. do.

In the encoder 101, when the rotating plate (not shown) rotates with the main gear 29, the brushes 112a and 112b slide along the patterns 111a and 111b of the conductive plate 111. In this case, as shown in FIG. 19, the patterns 111a and 111b of the conductive plate 111 change the electrical connection between the patterns 111a and 111b and the brushes 112a and 112b according to the pattern shapes. It is formed to make. The shapes of the patterns of the conductive plate 111 may be appropriately selected as necessary to continuously obtain position detection signals corresponding to the rotational position of the main gear 29.

The output signals S1 and S2 obtained from the brushes 112a and 112b as a result of the sliding movement along the patterns 111a and 111b of the conductive plate 111 of the encoder 101 are as shown in FIGS. 20A and 20B. Is changed. First as shown in FIG 20A, the output signal S1 of the brush (112a) it is changed to a low level and a high level in the time t ₃ to time t _3. In contrast, the output signal S2 of brushes (112b) is, as shown in the Fig. 20B, and a low level from the high level at time t ₁ changes to high level from low level at time t _2. The output signal S2 changes from high level to low level at time t ₄ . When the disc tray 2 is changed in the direction indicated by the arrow OP in FIGS. 20A and 20B, that is, during the unloading operation, the movement of the disc tray 2 is a PWM signal supplied to the loading motor 32. And braking by using time t ₂ as the brake application starting point. As a result, the disc tray 2 can be stopped at the position where the disc tray 2 protrudes from the opening 1c of the casing 1. The position where the disc tray 2 protrudes from the casing ₁ corresponds to the time t ₁ in FIGS. 20A and 20B. On the other hand, when the disc tray 2 is moved in the direction indicated by the arrow CL in FIGS. 20A and 20B, that is, in the loading operation, the disc tray 2 is supplied to the moving large motor 32 of the disc tray 2. It is braked by controlling the PWM signals and using time t ₃ as the brake application start point. As a result, the disc tray 2 can be stopped at the position where the disc tray 2 corresponding to the position of time t ₄ in FIGS. 20A and 20B is accommodated in the casing 1.

Referring now to FIGS. 21A-21C and 22A-22C, the control operation of the loading motor 32 by the controller 102 will be described.

As shown in FIGS. 21A and 21B, at the time of the unloading operation of the disc tray 2, both the output signals S1 and S2 of the encoder 101 are maintained at a high level. Under this condition, as shown in FIG. 21C, the control signal is supplied to the drive circuit 103, and the PWM signal PWM1 having the first duty rate is output from the drive circuit 103. As shown in FIG. The loading motor 32 is driven at a predetermined speed according to the PWM signal having the first duty ratio, and then the main gear 29 is driven at the predetermined speed accordingly. As a result, the disc tray 2 is loaded through the opening 1c of the casing 1 at a predetermined speed based on the rotational speed of the main gear 29. As shown in FIGS. 21A and 21B, the output signals S1 and S2 from the encoder 101 are maintained at a high level until time 12 when the output signal S2 changes from a high level to a low level. The fact that the output signal S2 is at a low level makes it possible to detect a state in which the main gear has reached a predetermined rotational speed. In other words, it can be detected that the disc tray 2 has reached a predetermined position. Based on the detection result, the controller 102 supplies a control signal to the drive circuit 103 as shown in FIG. 21C, and outputs a PWM signal PWM2 having a second duty ratio. For example, the duty of the PWM signal PWM2 having the second duty ratio is half of the duty of the PWM signal PWM1 having the first duty ratio. As a result, the rotational speed of the loading motor 32 is delayed in accordance with the state in which the PWM signal PWM1 having the first duty ratio is supplied. At the same time, the rotational speed of the main gear 29 and the moving speed of the disc tray 2 are slow compared to the main gear rotational speed up to time t ₂ and the moving speed of the disc tray. In other words, the brake is activated. Thus, the disc tray 2 is moved at a moving speed based on the PWM signal PWM2 having the second duty ratio at time t ₂ . Thereafter, the loading motor 32 continues to rotate, and as shown in FIG. 21B, at time t ₁ , the output signal S1 output from the encoder 101 changes from a low level to a high level. This change is detected by the controller 102. Based on the detection result, the controller 102 supplies a control signal to the drive circuit 103 to stop the output of the PWM signal and stop the driving of the loading motor 32. As a result, the rotation of the main gear 29 is stopped, and the movement of the disc tray 2 is also stopped, so that the disc tray is stopped at the disc replacement position at which the disc tray protrudes from the outer casing 1.

Next, the loading operation of the disc tray 2 is performed as follows. When the operation button 36 is operated and a loading command of the disc tray 2 is input into the controller 102, the controller 102 rotates the loading motor 32 to rotate in the direction opposite to that in the unloading operation. To control. As shown in FIG. 22C, the controller 102 inputs a control signal to the drive circuit 103 to output the PWM signal PWM3 having the third duty ratio from the drive circuit 103 based on the loading command. The loading motor 32 is rotated by the PWH signal PWM3 having the third duty ratio in the direction opposite to that in the unloading operation. The main gear 29 is thus also rotated in the direction opposite to the direction during the unloading operation. As a result, the disc tray 2 starts to move and is recovered into the outer casing 1 through the opening 1c.

Then, as shown in FIG. 22A, when the controller 102 detects that the output signal 51 from the encoder 101 changes from a high level to a low level at time 13, the controller 102 detects it. The control signal is supplied to the drive circuit based on the detection result. The driving circuit 103 outputs the PWM signal PWM4 having the fourth duty ratio based on the supplied control signal. For example, the duty of the PWM signal PWM4 having the fourth duty ratio is half of the duty of the PWM signal PWM3 having the third duty ratio. The PWM signal PWM4 having the fourth duty ratio is supplied to the loading motor 32, and the loading motor rotates slower than the rotational speed up to time t ₃ . As a result, since the main gear 29 rotates at a rotational speed slower than the rotational speed up to time t ₃ , the moving speed of the disc tray 2 is slowed down. In other words, these parts are subjected to braking influence in the same way as in the case of unloading operation.

Also, as shown in FIG. 22B, at time t ₄ , when the controller 102 detects that the output signal from the encoder 101 changes from a high level to a low level, the controller 102 detects the detection signal. On the basis of this, a control signal is supplied to the drive circuit 103 to stop the output of the PWM signal from the drive circuit 103. As a result, the rotational drive of the loading motor 32 is stopped, and the rotation of the main gear 29 is stopped. Thus, the disc tray 2 is also stopped. At this time, the disc tray 2 is stopped at a predetermined position in the outer casing 1.

As described above, the disc tray smoothly stops at a predetermined position when it protrudes from the opening 1c of the outer casing 1 in the unloading operation and is recovered into the outer casing 1 in the loading operation.

In the case of the above-described embodiment, two output signals S1 and S2 output from the encoder 101 are used to control the loading motor 32. However, three output signals S11, S21, S31 can be output from the encoder 101 by using three patterns on the conductive plate 111 as shown in FIGS. 23A to 23E. In the embodiment shown in FIGS. 23A-23E, the loading motor 32 can be controlled more precisely than in FIGS. 21A-21C. That is, in the case of the embodiment shown in FIGS. 23A to 23E, as best shown in FIG. 23D, the loading motor 32 has time based on the output signals S11, S21, S31 from the encoder 101. FIG. It is driven by a PWM signal PWM 5 having a fifth duty ratio up to t ₅ . As shown in FIG. 23A, when detecting that the output signal S11 has changed from the high level to the low level at time t ₅ , the controller 102 receives the PWM signal PWM 6 having the sixth duty ratio from the drive circuit 103. The control signal is provided to the driving circuit 103 to generate. The duty of the PWM signal PWM 6 having the sixth duty rate is half the duty of the PWM signal PWM 5 having the fifth duty rate. The moving speed of the disk tray 2 from time t ₅ to time t ₆ is slower than the moving speed up to time t ₅ . Also, as shown in FIG. 23B, when the controller 102 detects that the output signal S21 has changed from a high level to a low level at time t ₆ , the controller 102 supplies a control signal to the drive circuit 103. The PWM signal PWM 7 having the seventh duty ratio is output. For example, the duty of the PWM signal PWM 7 having the seventh duty rate is half the duty of the PWM signal PWM 6 having the sixth duty rate. The loading motor 32 is driven by the PWM signal PWM 7 having the seventh duty rate for a period up to time t ₇ . The moving speed of the disk tray (2) for the period of time from the time t ₆ to t ₇ is continuously reduced as compared with a moving speed for a period of time from time t ₆ to t _6. Then, as shown in FIG. 23C, when the controller 102 detects that at time t ₇ the output signal S31 from the encoder 101 has changed from a high level to a low level, the controller 102 is driven. A control signal is provided to the drive circuit 103 to stop the output of the PWM signal from the circuit 103 and stop the driving of the loading motor 32. At this time, the average voltage by the PWM signal supplied to the loading motor 32 is changed as shown in FIG. 23E.

As described above, in the case of the embodiment shown in FIGS. 23A to 23E, the speed of the loading motor 32 is more precisely than in the embodiment shown in FIGS. 21A to 21C and 22A to 22C. Can be controlled. Therefore, the disc tray 2 can be stopped more smoothly. 24B shows an example of the structure of the conductive plate 111 of the encoder 101. Three output signals S12, S22, and S32 shown in Figs. 25A to 25C are output from the conductive plate 111 shown in Fig. 24B. Patterns 111c, 111d, and 111e for generating output signals S12, S22, and S32 and a grounded common pattern 111f (C) are provided on the conductive plate 111. Each end of the four brushes (not shown) mounted on the rotating plate (not shown) of the encoder 101 are jointly electrically connected to each other, and the other ends are the patterns 111c, 111d, 111e, and 111f described above. Sliding contact with one of the The output signal from the brush slidingly moving on the pattern 111f is at a low level. As shown in FIG. 25A, the output signal S12 from the brush slidably moving on the pattern 111c changes from a high level to a low level at time 113 and changes from a low level to a high level at time t ₁₆ . do. Further, the output signal S12 is changed from high level to low level at time t ₁₇ and changed from low level to high level at time t ₁₉ . The pattern 111 is formed in a predetermined form to obtain such an output signal S12. As shown in FIG. 25B, the output signal S22 from the brush slidingly moving on the pattern 111d changes from a high level to a low level at a time t ₁₁ , and changes from a low level to a high level at a time t ₁₂ . do. In addition, the output signal S22 changes from a high level to a low level at time t ₁₄ and changes from a low level to a high level at time t ₁₆ . The output signal S32 from the brush slidably moving on the pattern 111e changes from a high level to a low level at time t ₁₅ as shown in FIG. 25C. The pattern 111e is formed into a predetermined shape after obtaining such an output signal S32. On the other hand, as shown in Figs. 24A and 24B, in this embodiment, 0 ° is taken as a reference. 0 ° in FIG. 24B corresponds to time t ₁₅ in FIGS. 25A to 25C. "Time t ₁₅ " shows the state in which the disc tray 2 is withdrawn into the outer housing 1 and the pivot member 10 is in the raised position. Thus, time t ₁₁ corresponds to a rotation angle of -200 ° in FIG. 24A. In the same way, time t ₁₂ corresponds to a rotation angle of -181 °, time t ₁₃ corresponds to a rotation angle of -93 °, time t ₁₄ corresponds to a rotation angle of -48 °, and time t ₁₆ Corresponds to a rotation angle of 27 °, time t ₁₇ corresponds to a rotation angle of 100 °, time t ₁₈ corresponds to a rotation angle of 113 °, and time t ₁₉ corresponds to a rotation angle of 120 ° ± 2 ° . In addition, at time t ₁₄ , the disc tray 2 is withdrawn into the outer casing 1, and the turning member 10 is located in the lowered position. At time t ₁₆ , during optical disc playback, the disc tray 2 is withdrawn from the outer casing 1, and the disc tray 2 prevents the disc tray 2 from being pressed into the outer casing 1. It is prevented from moving from such a state by the locking mechanism composed of the locking lever 40, the cam portion of the main gear 29 and the stopper accommodating portion 2g of the disc tray 2.

The time t ₁₁ to t ₁₄ in FIGS. 25A to 25C ranges from loading or unloading of the disc tray 2 when the optical discs 7a and 7b are in a non-playback state (non-playback state). It is assigned to control the loading motor 32 in operation. The range from time t ₁₅ to time t ₁₉ is allocated to control the loading motor 32 of the disc tray 2 when the optical discs 7a and 7b are in the playback state. That is, when the disc tray 2 is in the state of being recovered into the inside of the outer casing 1, the output signals S12, S22, S32 corresponding to the positions between the time t ₁₄ and the time t ₁₅ are encoded by the encoder 101. Is output from At this time, the output signals S12 and S22 are at a low level, and the output signal S32 is at a high level. These output signals S12, S22, S32 are supplied into the controller 102, and on the basis of these output signals S12, S22, S32, the controller 102 can detect the position of the disc tray 2. When the powder is operated, the disc tray 2 is not always recovered. In this case, the controller 102 can determine the position of the disc tray 2 based on the levels of the output signals S12, S22, S32 from the encoder 101. Based on this determination, the controller 102 generates a control signal and determines the rotational direction of the loading motor 32 and the duty of the PWM signals output from the drive circuit 103.

Now consider the case where the optical discs 7a and 7b are in the non-playback state. Under this condition, when the operation button 3b is activated and a command for unloading the disc tray 2 is input into the controller 102, the main gear 29 is counterclockwise as shown in FIG. Output in the direction. In this case, the output signals S12, S22, S32 are changed in accordance with the time zone in the direction indicated by the arrow OP ₁ in FIGS. 25A to 25C. As a result, at time t ₁₄ , the output signal S22 changes from a low level to a high level, and at time t ₁₃ , the output signal S12 changes from a low level to a high level. As described above, since the pivot member 10 is moved from the raised position to the lowered position for the period up to the time t ₁₄ , the tray 2 is almost kept in a fixed state. In practice, the disc tray starts to move at time t ₁₄ . Then, the main gear 29 continues to rotate in the counterclockwise direction, and the disc tray 2 is moved in the direction in which the disc tray protrudes through the opening 1c of the outer casing 1. As shown in Fig. 25B, at time t ₁₂ , when the output signal S22 from the encoder 101 is changed from a high level to a low level, as described above, the controller 102 is supplied from the driving circuit 103. This will reduce the duty of the PWM signal. As a result, a brake signal is applied to the loading motor 32 so that the moving speed of the brake signal disk tray 2 is reduced. Then, at t11, when the controller 102 detects that the output signal S22 has changed from the low level to the high level, a control signal is supplied into the drive circuit 103 to stop the driving of the loading motor 32. . As a result, the disc tray 2 is moved to the position shown in FIG. 11, that is, the unloading position and stopped at that position.

In the unloading position, when the exchange and loading operation of the optical disks 7a and 7b of the turn table 4 is completed, and the operation button 3b is operated to input the loading command to the controller 102, 102 drives the loading motor again in accordance with the PWM signal of the predetermined duty output from the driving circuit 103 described above. In this case, each of the output signals S12, S22, S32 is changed in the direction indicated by arrow CL ₁ in FIGS. 25A to 25C. As a result, the main gear 29 is driven to rotate clockwise, that is, in a direction opposite to that in the unloading operation. In response to the rotation of the main gear in the clockwise direction, the output signal S22 from the encoder 101 changes from a high level to a low level at time t ₁₁ as shown in FIG. 25B, and from a low level to a high level at time t ₁₂ . Is changed. This change is ignored in the loading operation of the disc tray 2.

Then, as shown in FIG. 25A, at time t ₁₃ , when the controller 102 detects that the output signal S12 from the encoder 101 has changed from a high level to a low level, the controller 102 causes the driving circuit 103 to be executed. Supply control signal. The drive circuit 103 supplies a small duty PWM signal to the loading motor 32 based on the control signal. As a result, the loading motor 32 is affected by the brake, and the driving speed of the disc tray 2 is lowered. At time t ₁₄ , when the controller 102 detects that the output signal S22 from the encoder has changed from a high level to a low level, a control signal is supplied from the encoder 102 to the drive circuit 103 to drive the circuit 103. The output of the PWM signal from is stopped. As a result, the movement of the disc tray 2 is stopped, and the disc tray 2 is recovered to the external tasing 1 as shown in FIG. At this time, the loading motor 32 is stopped once. The turn table drive motor 32 is then rotated to rotate the turn table 4 to move the optical disc to a target point on the turn table, which is the position at which the optical disc faces the disk table 12. The loading motor 32 is rotated again based on the control signal from the controller 102 and the pivot member 10 is moved from the lower position to the raised position. As a result, the chucking plate 13 and the disk table 12 clamp the optical disk. As shown in FIG. 25C, when the output signal S32 changes from a high level to a low level at time t ₁₅ , the controller 102 generates a control signal to stop the rotational drive of the loading motor 32. In this state, when the playback operation signal is input from the input section, the optical disks 7a and 7b are rotationally driven by the spindle motor 11 to read the information signals recorded on the optical disk by the optical pickup 9.

If an unloading command is input to the controller 102 by the operation button 3b during the playback operation of the optical discs 7a and 7b, the controller 102 controls the drive circuit 103 and removes the loading motor 32. The PWM signal is supplied to rotate in the clockwise direction shown in FIG. As shown in FIG. 25A, at time t ₁₆ , the output signal S12 from the encoder 101 is changed from a low level to a high level. At time t ₁₅ , the output signal S32 changes from a high level to a low level. In the unloading operation no process is performed based on changes in these output signals. In this case, each output signal S12, S22, S32 is changed in the direction shown by arrow OP2 shown in Figs. 25A to 25C. Then, when the system controller 102 detects that the output signal S12 from the encoder 101 has changed from a high level to a low level at time t17, the system controller 102 based on the detection result, the drive circuit A control signal is generated at 103. The driving circuit 103 outputs a PWM signal having a duty rate smaller than that of the PWM signal supplied to the loading motor before the time t17 to the loading motor 32 as a control signal. As a result, the loading motor 32 is subjected to a brake effect, and the opening motor 1c of the disc tray 2 moves in the direction in which the disc tray 2 protrudes through the opening 1c of the outer casing 1. The moving speed of the disc tray 2 moving in the protruding direction is reduced. As shown in FIG. 25B, when the system controller 102 detects that the output signal S22 from the encoder 101 has changed from a low level to a high level at time t ₁₆ , the disc tray 2 is shown in FIG. As during playback, the unloading position is reached and stops slowly. If the main gear 29 is further rotated, as shown in FIG. 25A at time t ₁₉ , the output signal S12 from the encoder 101 changes from a low level to a high level, and the cam portion of the main gear 29 29h presses the cam input portion 40h of the lock lever 40 to cause the lock lever 40 to rotate in the counterclockwise direction shown in FIG. 8, and the stopper portion 40a of the disc tray 2 Meshes with the stopper housing portion 2g. In this situation, when the disc tray is pressed as described above, the stopper 40a is engaged with the stopper accommodating portion 2g to lock the disc tray 2. This locking action requires a certain amount of force. Therefore, the duty ratio of the PWM signal supplied to the loading motor 32 again during the period from time t ₁₈ to time t ₁₉ is increased. The drive of the loading motor 32 is stopped at time t ₁₉ . The loading operation during playback is performed in the same way as the loading operation during non-playback. In this case, the output signals S12, S22, S32 from the encoder 101 are changed in the direction of the arrow CL ₂ shown in FIGS. 25A to 25C. The output signals S12, S13 of time t ₁₇ and time t ₁₈ are changed. Changes are ignored during loading operations during playback operations. When a loading command is input to the controller 102 during the playback operation, a PWM signal having a predetermined duty ratio is output from the drive circuit 103 based on the control signal from the controller 102. As a result, the loading motor 32 is driven to rotate to pull out the disc tray 2 through the opening 1c of the outer casing 10. If at time t ₁₆ the controller 102 detects that the output signal S12 from the encoder 101 has changed from a high level to a low level, the controller 102 reduces the duty of the PWM signal output from the drive circuit 103. Generate a control signal. As a result, the loading motor brake effect is received and the moving speed of the disc tray 2 is reduced. Then, at time t ₁₅ , when the controller 102 detects that the output signal S32 has changed from a low level to a high level, the controller 102 controls the drive circuit 103 to stop driving the loading motor 32. Supply the signal.

Now, the control operation of the controller 102 for performing the above-described loading or unloading operation will be described. In step ST1, the controller 102 measures whether a predetermined time e.g. 3.2 msec has elapsed since the loading motor 32 was driven. This is done by repeating the process of step 2 (ST2) every 3.2 msec. The time elapsed for 3.2 msec is measured because processes different from the progress of step 2 (ST2) are performed together according to time zones. Therefore, omitting step 1 (ST1) does not affect the progress of step 2 (ST2) at all.

If the controller measures that the predetermined time (3.2 msec) has elapsed in step 1 (ST1), the program proceeds to step 2 (ST2). In step 2 (ST2), the output signals S12, S22, S32 from the encoder 101 are read out, and in step 3 (ST3), the adverse effects of chattering from the respective output signals S12, S22, S32 are eliminated. The signal level is unstable immediately after the output signals S12, S22, S32 are respectively changed. In this level unstable state, the level of each output signal is determined and there is a risk of error being detected, so that the sampling operation is repeated a plurality of times, and the controller 102 determines whether each result represents the same signal level, i.e. It is detected whether this result indicates a high level or a low level as shown in Figs. 25A to 25C. If it is detected by a plurality of sampling operations that the signal level of the outgoing signal is kept at the same level, the controller 102 takes an output signal from the encoder 101 as output signal data. When chattering is removed from the output signal, the program enters step 4 (ST4). In step 4 (ST4), the controller 102 outputs signals S12, S22 from the encoder 101 whether the rotational position of the main gear 29, that is, the position of the disc tray 2 relative to the disc player has reached the target position. , S23 is determined based on the respective levels. The position of the disc tray 2 is sensed by determining that the output signals S12, S22, S23 are at high or low levels. If in step 4 (ST4) the current position and the target position are not the same as each other, the program enters step 5 (ST5). In step 5 (ST5), the current position and the target position are compared with each other and the rotation direction of the main gear 29 is determined. The controller 102 determines the rotational direction of the main gear 29 according to the case where the disc tray 2 exists in the range t ₁₁ to t ₁₉ in FIGS. 25A to 25C based on the respective signals S12, S22 and S23. It determines whether the operation is a loading operation or an unloading operation during non-playback, and whether the operation is a loading operation or an unloading operation during playback. For example, if the operation is a loading operation of the disc tray during non-playback of the discs 7a and 7b, the main gear 29 is driven to rotate clockwise in FIG. 6, and when the unloading operation, the main gear 29 is counterclockwise Is rotated in the direction. If the operation is loading operation of the disc tray during playback of the discs 7a and 7b, the main gear 29 is rotated in the counterclockwise direction in FIG. 6, and in the unloading operation, the main gear 29 rotates in the clockwise direction. do. At this time, the program enters step 6 (ST6). In step 6 (ST6), the duty of the PWM signal to be supplied to the loading motor is determined based on the current rotational position of the disc tray 2 or the rotational position of the main gear 29 and the direction determined in step 5 (ST5). As described above, since the current position is sensed based on the signal levels of the respective output signals S12, S22, S32 from the encoder 101, the duty of the PWM signal is determined based on this result. For example, if the operation is an unloading operation of the disc tray during non-playback, a PWM having a duty corresponding to the first duty ratio PWM signal PWM 1 shown in Fig. 21C for a PWM signal in the range of t ₁₄ to t _{12 is} shown. The signal is output from the drive circuit 102. Then, for example, for a duty of t ₁₂ to t ₁₁ , a PWM signal having a duty corresponding to the second duty ratio PWM signal PWM 2 is output from the driving circuit 103. In other words, as described above, at the position just before reaching the position where the disc tray 2 is withdrawn from the opening 1c of the outer casing 1 and at the position where the disc tray 2 is withdrawn into the outer casing 1. The period immediately before reaching is set to have a duty less than the period preceding the periods. Determination of the duty of the PWM signal is performed based on the data stored in the ROM 102A in the controller 102 or the conversion table. At this time, the program proceeds to step 7 (ST7). The PWM signal is supplied from the drive circuit 103 to the loading motor 32 on the basis of the duty determined in step 6 (ST6), and the motor 32 is driven. After step 7 (ST7), the program returns to step 1 (ST1) again and it is determined whether 3.2 msec has elapsed. If 3.2 msec has elapsed, the operation of receiving the output from the encoder 101 is performed again.

If it is determined in step 4 (ST4) that the current position and the ticket position coincide with each other, the program enters step 8 (ST8) in which the rotation of the loading motor 32 is stopped. In the state of step 8 (ST8), the disc tray 2 is pulled out through the opening 1c of the outer casing 1, that is, in the exchange position or the position where the disc tray 2 recovers to the outer casing 1. In other words, since it is in the playback position, the replacement of the optical disc or the playback operation of the optical disc is performed.

In the above embodiment, the encoder is described as being a contact type, but any type of encoder capable of continuously detecting the rotation of the main gear and continuously obtaining the detection signal according to the rotation of the main gear can be used. For example, in the case of an optical encoder, an encoder plate having an optically sensed slit-like pattern corresponding to the conductive plate may be mounted on the main gear to rotate together with the main gear, and the optical pattern is detected by the light source and the optical sensor. can do.

In the above embodiment, the disc player using the optical disc as the disc-shaped recording medium has been described, but any type of recording medium other than the disc-shaped recording medium may be used. The present invention is also applicable to a recording and / or reproducing apparatus using a tape-type recording medium such as a tape cassette or a cartridge as the recording medium.

In addition, the above-described embodiment has described a disc player for selectively reproducing an optical disc by arranging a plurality of discs on a turn table arranged on a disc tray and rotating the turn table. However, the present invention is not limited to this, but can also be applied to a recording and / or reproducing apparatus using a rewritable optical disc.

Various details of the invention may be changed without departing from the spirit and scope of the invention. In addition, the foregoing description of the embodiments according to the present invention is provided for the purpose of illustration only and not for the purpose of limiting the invention, including what is set forth in the appended claims and equivalents thereof.

Claims (5)

An apparatus for loading a recording medium, A conveying member for conveying the recording medium between the recording medium exchange position and the recording medium recording and / or reproducing position; And a detecting unit connected to the conveying member for driving the conveying member, and a detecting unit for continuously detecting a rotational amount of the rotating driving unit corresponding to the position of the conveying member. Drive means, Controlling the rotary drive unit in response to a detection signal from the detection unit such that the moving speed of the conveying member is gradually reduced as the conveying member approaches one of the recording medium exchange position and the recording and / or reproducing position. Control means, The rotary drive unit includes a drive motor and a gear to which a driving force from the drive motor is supplied, the gear engaged with the conveying member to drive the conveying member between the exchange position and the recording and / or reproducing position. Wherein the amount of rotation corresponds to the position of the conveying member, and the detection unit is mounted on the gear and the conductive plate provided on the fixing part of the device and provided with a plurality of electrically conductive patterns thereon And a plurality of brushes moving together with the rotation of the gear to be in contact with the device. An apparatus for loading a disc shaped recording medium, A conveying member for conveying the disk-shaped recording medium between the disk-shaped recording medium exchange position and the disk-shaped existing medium recording and / or reproducing position; Drive means connected to the conveying member for driving the conveying member and including a gear having a driving force supplied by a drive motor; Detecting means for continuously detecting a position of the conveying member moved by a driving force from the driving means in accordance with the movement of the gear of the driving means; Control to control the driving means in response to a detection signal from the detecting means such that the moving speed of the conveying member is gradually reduced as the conveying member approaches one of the recording medium exchange position and the recording and / or reproducing position. Means, The gear is coupled with the conveying member to drive the conveying member between the exchange position and the recording and / or reproducing position, and the detection unit is mounted on a fixed portion of the apparatus and there are a plurality of electrically conductive patterns thereon. And a plurality of brushes mounted on the gear and provided with the movement of the gear so as to contact the conductive plate. A disk-type recording medium loading apparatus according to claim 2, wherein the drive operation of the drive motor is controlled by a PWM signal supplied as a control signal from the control means. 4. A drive according to claim 3, wherein said drive means receives said control signal generated by said control means in response to a detection signal from said detection means for generating said PWM signal having a duty based on said control signal. Disc type recording medium loading apparatus comprising a circuit. Conveying the recording medium between the recording medium exchange position and the recording and / or reproducing position for the recording medium by the driving force transmitted from the driving means supplied with the PWM signal, wherein the driving means has the driving force supplied by the drive motor; A conveying device for conveying a recording medium by using a conveying member, including a gear, wherein the gear is engaged with the conveying member to drive the conveying member between the exchange position and the recording and / or reproducing position. In the method, Contacting the plurality of brushes mounted on the gears with the plurality of electrically conductive patterns formed on the conductive plates mounted on the fixing part of the apparatus such that the plurality of brushes move with the movement of the gears in order to contact the conductive plates. Continuously detecting the position of the conveying member by the detecting means as the gear moves; Generating a control signal for controlling the duty of the PWM signal in accordance with the position of the conveying member in response to the detection signal from the detection means obtained in the continuous detection step; Based on the response to the control signal generated in the control signal generating step to gradually reduce the moving speed of the conveying member when the conveying member approaches one of the recording medium exchange position and the recording and / or reproducing position. Changing the duty of the PWM signal Recording medium transport apparatus control method comprising a.